phc-discussions - Re: [PHC] A review per day

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Thu, 04 Sep 2014 10:04:16 -0400
From: Bill Cox <waywardgeek@...hershed.org>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] A review per day - skipping Makwa

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 09/04/2014 09:07 AM, waywardgeek@...hershed.org wrote:
> I would massively pipeline a multiplier for this circuit. With a
> 4096 by 4096 multiplier I might have up to 8192 pipeline stages.
> This is a much stronger attack than the one on bcrypt.  How fast
> can a CPU do a large multiply like this?
> 
> This attack will spend far less power per multiply.  However in
> reality this attack will be limited by how quickly power can be
> sucked out of the ASIC.  I would be tempted to consider a booth
> multiplier and dynamic logic to lower power and size. Regardless,
> it will still produce one multiply result per clock. It should be
> built in a low power process so it will not run as fast as your
> CPU.   The better the geometry the better the power.


I need to do a proper analysis to finish this comparison.  I find this
*very* interesting, so I'm doing it right now... until my boss gets
pissed.  It might take most of the day.

Bill
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=OKUI
-----END PGP SIGNATURE-----